Laars MagnaTherm MGH1600 Installation And Operation Instructions Manual page 85

MagnaTherm Boilers and Water Heaters
Code Description
108 Flame lost in run
109 Ignition failed
110 Ignition failure occurred
111 Flame current lower than weak
threshold
113 Flame circuit timeout
119 Control Interaction Fault
122 Lightoff rate proving failed
123 Purge rate proving failed
128 Fan speed failed during prepurge
Lockout Procedure
or Hold
L 1. Check main valve wiring and operation -
correct any errors.
2. Check the fuel supply.
3. Check fuel pressure and repeat turndown tests.
4. Check ignition transformer electrode, flame
detector, flame detector siting or flame rod
position.
5. If steps 1 through 4 are correct and the fault
persists, replace the module.
L 1. Check main valve wiring and operation -
correct any errors.
2. Check the fuel supply.
3. Check fuel pressure and repeat turndown tests.
4. Check ignition transformer electrode, flame
detector, flame detector siting or flame rod
position.
5. If steps 1 through 4 are correct and the fault
persists, replace the module.
H Hold time of recycle and hold option. Will not be
a lockout fault. Hold Only. Internal hardware test.
Not a lockout.
H Hold time of recycle and hold option. Will not be
a lockout fault. Hold Only. Internal hardware test.
Not a lockout.
L Flame sensed during Initiate or off cycle, hold 240
seconds, if present after 240 seconds, system will
lockout.
H Flap valve identifications configured incorrectly.
L 1. Check wiring and correct any potential wiring
errors.
2. Check VFD's (Variable-speed Fan Drive)
ability to change speeds.
3. Change the VFD
4. If the fault persists, replace the module.
L 1. Check wiring and correct any potential wiring
errors.
2. Check VFD's (Variable-speed Fan Drive)
ability to change speeds.
3. Change the VFD
4. If the fault persists, replace the module.
H or L 1. Check wiring and correct any potential wiring
errors.
2. Check the VFDs (Variable-speed Fan Drive)
ability to change speeds.
3. Change the VFD
4. If the fault persists, replace the module.
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